Behind the Smart Gadgets, Amazon and Google Are Waging War

Google has plastered digital billboards and the Las Vegas Monorail with the "Hey Google" wake-up command. It's announced a range of new gadgets featuring its assistant on everything from smart displays to pressure cookers. And it's sent out the clowns -- a jumpsuit-wearing army of advertising associates wearing brightly-colored Converse sneakers and hovering around partner firms' booths to explain how Google's technology works.